/**
 * Copyright 2008 Mathias Doenitz, http://lis.to/
 *
 * This file is part of the lis.to java desktop client. The lis.to java desktop client is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * The lis.to java desktop client is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with the lis.to java desktop client.
 * If not, see http://www.gnu.org/licenses/
 */

package listo.client.dragdrop;

import com.google.inject.Inject;
import listo.client.ContextManager;
import listo.client.model.operations.Operation;
import listo.utils.exceptions.Exceptions;
import listo.utils.logging.Log;

import javax.swing.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

public abstract class BaseTransferHandler extends TransferHandler {

    protected final Log log;
    protected final ContextManager contextManager;

    @Inject
    public BaseTransferHandler(ContextManager contextManager, Log log) {
        this.contextManager = contextManager;
        this.log = log;
    }

    protected Object getSelection(TransferSupport support, DataFlavor dataFlavor) {
        Object transferData;
        try {
            transferData = support.getTransferable().getTransferData(dataFlavor);
        }
        catch (UnsupportedFlavorException e) {
            throw new IllegalStateException(e);
        }
        catch (IOException e) {
            throw new IllegalStateException(e);
        }
        return transferData;
    }

    public boolean importData(TransferSupport support) {
        try {
            if (!canImport(support)) return false;

            final Operation op = createDropOperation(support);
            if (op == null) return false;

            // we need to run the operation later since Swing sometimes chokes if we change the model in importData()
            SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    contextManager.addAndRun(op);
                }
            });
            return true;
        }
        catch (Exception e) {
            log.error("Uncaught exception:\n%1$s", Exceptions.getTrace(e));
            throw new RuntimeException(e);
        }
    }

    protected abstract Operation createDropOperation(TransferSupport support);

}
